shader graph help

hey im trying to learn how to use shader i have main texture and a pattern texture im trying to show the pattern when the alpha of the maintex is descreasing to make dither effect, I tried using multiply but nothing happens, im new to shader graphs im trying to find a tutorial to youtube but i didn’t find anything that could help me

Also TRIED this but it only change the alpha sprite

Try #2 i was able to make the sprite change its aplha like dither pattern but it has black banground